function Select() {
	var model=document.form_4.model.value;
	var xhr = null;
	
	if (model=="")
		alert("ERREUR : Veuilliez indiquer le model");
	else {
		if (window.XMLHttpRequest) {
			xhr = new XMLHttpRequest();
		} else if (window.ActiveXObject) {
			xhr = new ActiveXObject("Microsoft.XMLHTTP");
		}
		xhr.open("GET", "Select_query.jsp?model=" + model, false);
				xhr.send(null);
				
		
	
		document.getElementById("result").innerHTML = xhr.responseText;
	}

}